Attachment-plug cap



" Oct. 8, 1929. A. J. BLAKE I ATTACHMENT PLUG-CAP Filed May 5, 192a Igmento o attozmqs, I

Patented Oct. 8, 1929 UNITED STATES PATENT OFFICE ABTHURJ. BLAKE, FBRIDGEIORT, CONNECTICUT, ASSIGNOR TO HARVEY HUBBELL, INCORPORATED, OFBRIDGEPORT, CONNECTICUT, A CORPORATION OF CONNECTICUT ATTACHMENT-PLUGon:

Application filed May 5, 1928. Serial No. 275,327.

This invention relates to attachment plug caps, such as are used onelectrical lead wires for portable electrical devices and adapted to beinserted into outlet receptacles for supplying power to these devicesfrom the house wlring system.

It has for an object to simplify the construction and provide a morerigid and reliable mounting for the contacts in the body of the cap.

With the above and other objects in View, the invention consists incertain novel features of construction, combinations and arrangements ofparts as will be more fully described, the preferred constructioninvolving my invention being shown in the accompanying drawing. In thisdrawing,

Fig. 1 is a longitudinal section through a cap embodying my inventiontaken substantially on line 11 of Fig. 2, but with one blade and plateand the free portion of the other plate shown in elevation.

Fig. 2 is an end elevation looking toward the bottom of Fig. 1.

Fig. 3 is a detail section substantially on line 3-3 of Fig. 2.

Fig. 4 is an edge view of the contact blade removed.

Fig. 5 is a front elevation thereof. 0 Fig. 6 is an end view lookingtoward the bottom of Fig. 4.

Fig. 7 is a plan view of the binding post plate, and

Fig. 8 is an edge elevat1on.

At the present time the commorf construction for attachment plug caps isto form a binding post plate and its knife blade contact in one piece,the blade being bent laterally from one edge of the plate Each elementis mounted in the insulating body by means of an eyelet or insert moldedin the body and passing through an opening in the plate with its freeend spun over to thus secure the plate to the body. In this arrangementthe eyelets or inserts must be very accurately positioned and theoperations of assembling the plates on these eylets and spinning overthe eyelets are relatively expensiye,

In my present construction I do away with 60 these eyelets and mold thecontact blades d1- ,ing material, and is provided with a cavity 11 atits lower side in which the contacts are mounted. It also has alongitudinal opening 12 for the lead wires, not shown, from a portableelectrical attachment.

The contact blades 13 are of the usual shape substantially rectangularin cross section and are arranged in parallel relation on opposite sidesof the opening 12. Each blade is constructed, as shown more clearly inFigs. 4, 5 and 6. That is, it is provided with an offset 14 spaced fromits inner end to provide a shoulder and also to position the inner endportion 15 a suitable distance to one side of the contact portion 13. Inmounting these contacts in the body 10 this end portion 15 is moldedinto the material of the body, and it may be provided with a transverseopening 16 or other suitable means to provide a greater grip and holdingeffect with the molded material. The opening 16 permits some of thematerial to flow into it or be forced into it 80 during the moldingoperation. It is pre- 4 ferred that the contacts be positioned in thebody so that the shoulder or ofiset portion 14 rests against the bottomof a recess in the bottom wall of the recess 11, as shown in Fig. 1. Informing these contact blades a lug 17 is cut on three sides, preferablyfrom the ofi'set portion 14 so that when the portion 15 is bentlaterally thereto this lug will' extend outwardly from the ofiset insubstantial alignment withthe portion 15 as shown in Fig. 4.

The binding post plates 18 are constructed as shown more clearly inFigs. 7 and- 8. They are stamped from sheet metal and curved on theouter edges to correspond with the curva-' 93 ture of the recess 11, andcarry means for securing the lead wires thereto, such as the bindingscrews 19. On its inner edge. this plate is provided witha notch 20 toreceive the body portion of a contact 13, and spaced 100 laterally fromthis notch is provided with an opening 21 to receive the securing lug17. In assembling this plate it is placed in the recess 11 with thecontact blade 13 resting in the notch 20 and the lug 17 extending intothe opening 21. The blade now rests on the outer wall of the oflset 14,and by riveting over the outer free end of the lug 17 the plate 18 issecurely fastened to the contact blade 13 and secured by it to theinsulating body. It will, of course, be understood that the body isprovided with a recess 22 to receive the inner end of the binding screw19, this recess being molded at the time the body is molded.

This arrangement provides a very strong and rigid construction which isfirmly mounted in position in the body of the cap, and the contact bladeis both directly mounted in the body and acts-as a means for securingthe binding post plate to this body.

Having thus set forth the nature of my invention, what I claim is:

1. In an attachment plug cap, an insulating body member, a blade contactmolded at one end in the body, a plate, a lug struck up from the contactextending into the plate and riveted over to secure the plate to thecontact, and means for securing a lead wire to said plate.

2. In an attachment plug cap, an insulating body member, a blade contactinserted at one end in said body and offset laterally to provide ashoulder, a lug struck from the contact adjacent said shoulder, and abinding post plate resting against said shoulder and provided with anopening through which said lug extends and is riveted over to secure theplate to the contact.

3. In an attachment plug cap, an insulating body member, a blade contactmolded at one end in said body and provided with a struckup lug, and abinding post plate having a notch in one edge to receive said contactand an opening for said lug which is riveted over tosecure the plate tothe contact.

4. In an attachment plug cap, an insulating body member, a blade contactinserted at one end in the body and having an offset providing ashoulder, and a binding post plate resting against said shoulderprovided with a notch to receive the contact and riveted thereto.

, 5. In an attachment plug cap, an insulating body member, a contactelement offset intermediate its ends to provide a shoulder and molded atone end in the body, a plate element resting against said shoulder, aplug struck up from one of said elements and extending through the otherelement and riveted over to secure the elements together, and means forsecuring a lead wire to said plate.

6. In an attachment plug cap, an insulating body member, a blade contactmolded at one end in said body and offset to provide a shoulder restingagainst the body, a binding

